[PATCH] ACPI/Processor: Add CPU_STARTING_FROZEN check in the acpi_cpu_soft_notify()

From: Lan Tianyu
Date: Thu Jul 31 2014 - 05:22:44 EST

The callback of CPU_STARTING event can't sleep and so acpi_cpu_soft_notify()
return directly when CPU_STARTING event is triggered. But cpu hotplug also
happens during S2RAM. The action will become CPU_STARTING_FROZEN. This
patch is to fix missing check the frozen event.

Signed-off-by: Lan Tianyu <tianyu.lan@xxxxxxxxx>
drivers/acpi/processor_driver.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/acpi/processor_driver.c b/drivers/acpi/processor_driver.c
index 4fcbd67..66e2249 100644
--- a/drivers/acpi/processor_driver.c
+++ b/drivers/acpi/processor_driver.c
@@ -125,7 +125,7 @@ static int acpi_cpu_soft_notify(struct notifier_block *nfb,
* CPU_STARTING and CPU_DYING must not sleep. Return here since
* acpi_bus_get_device() may sleep.
- if (action == CPU_STARTING || action == CPU_DYING)
+ if ((action & ~CPU_TASKS_FROZEN) == CPU_STARTING || action == CPU_DYING)

if (!pr || acpi_bus_get_device(pr->handle, &device))

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